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Coscueta ER, Pintado ME, Picó GA, Knobel G, Boschetti CE, Malpiedi LP, Nerli BB. Continuous method to determine the trypsin inhibitor activity in soybean flour. Food Chem 2017; 214:156-161. [PMID: 27507460 DOI: 10.1016/j.foodchem.2016.07.056] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Revised: 06/26/2016] [Accepted: 07/09/2016] [Indexed: 12/01/2022]
Abstract
The determination of trypsin inhibitor (TI) activity is of importance to evaluate the nutritional value of soybean flours. An analytical method, which involves a continuous spectrophotometric rate determination for trypsin activity against the substrate N-benzoyl-DL-arginine p-nitroanilide, is proposed as an alternative to the standard discontinuous assay. Stopping the reaction with acetic acid and a centrifugation/filtration step to decrease turbidity are not required, thus reducing costs and sample preparation time. The TI activity of different flour samples, determined by both assays, demonstrated to be statistically comparable, irrespective of the TI concentration level. The coefficients of variation of the novel method did not exceed 8% at any concentration level. The curves of progress reaction showed a non-linear behavior in samples without TI. A reduction of incubation time from 10min to 2min increased the method sensitivity and extended its linear range. A more economical, faster and simpler assay was developed.
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Affiliation(s)
- Ezequiel R Coscueta
- IPROBYQ (Instituto de Procesos Biotecnológicos y Químicos), UNR, CONICET, Facultad de Ciencias Bioquímicas y Farmacéuticas (FCByF), Suipacha 570, S2002LRK Rosario, Argentina; CBQF (Centro de Biotecnologia e Química Fina), Laboratório Associado, Escola Superior de Biotecnologia, Universidade Católica Portuguesa/Porto, Rua Arquiteto Lobão Vital, Apartado 2511, 4200 Porto, Portugal
| | - Manuela E Pintado
- CBQF (Centro de Biotecnologia e Química Fina), Laboratório Associado, Escola Superior de Biotecnologia, Universidade Católica Portuguesa/Porto, Rua Arquiteto Lobão Vital, Apartado 2511, 4200 Porto, Portugal
| | - Guillermo A Picó
- IPROBYQ (Instituto de Procesos Biotecnológicos y Químicos), UNR, CONICET, Facultad de Ciencias Bioquímicas y Farmacéuticas (FCByF), Suipacha 570, S2002LRK Rosario, Argentina
| | - Gastón Knobel
- IPROBYQ (Instituto de Procesos Biotecnológicos y Químicos), UNR, CONICET, Facultad de Ciencias Bioquímicas y Farmacéuticas (FCByF), Suipacha 570, S2002LRK Rosario, Argentina
| | - Carlos E Boschetti
- IPROBYQ (Instituto de Procesos Biotecnológicos y Químicos), UNR, CONICET, Facultad de Ciencias Bioquímicas y Farmacéuticas (FCByF), Suipacha 570, S2002LRK Rosario, Argentina
| | - Luciana Pellegrini Malpiedi
- IPROBYQ (Instituto de Procesos Biotecnológicos y Químicos), UNR, CONICET, Facultad de Ciencias Bioquímicas y Farmacéuticas (FCByF), Suipacha 570, S2002LRK Rosario, Argentina
| | - Bibiana B Nerli
- IPROBYQ (Instituto de Procesos Biotecnológicos y Químicos), UNR, CONICET, Facultad de Ciencias Bioquímicas y Farmacéuticas (FCByF), Suipacha 570, S2002LRK Rosario, Argentina.
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Asan A, Knobel G, Stene-Larsen G. [Experiences with the use of levomepromazine and diazepam as premedication for dental treatment of the mentally handicapped]. Nor Tannlaegeforen Tid 1986; 96:259-61. [PMID: 2944075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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